CVE-2025-25740: D-Link DIR-853 A1 FW1.20B07 was discovered to contain a stack-based buffer overflow vulnerability via the PSK

Routine

MEDIUM 5.5MITIGATE

CVE-2025-25740 is a medium-severity flaw (CVSS 5.5) affecting dir-853 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

D-Link DIR-853 A1 FW1.20B07 was discovered to contain a stack-based buffer overflow vulnerability via the PSK parameter in the SetQuickVPNSettings module.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-121
Published	2025-02-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: dlink

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-02-14 15:15 UTCPublished CVE record published
2026-06-17 09:01 UTCUpdated Record last modified

dlink dir-853 firmware MITIGATE

Affected: 1.20b07

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.20b07

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-25740?

dir-853 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-25740 being exploited?

CVE-2025-25740 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-25740 affect?

CVE-2025-25740 affects dir-853 firmware. Severity is medium (CVSS 5.5). D-Link DIR-853 A1 FW1.20B07 was discovered to contain a stack-based buffer overflow vulnerability via the PSK parameter in the SetQuickVPNSettings module.

How urgent is CVE-2025-25740?

Priority 31/100. Public exploit reference

Software pages

D-Link vulnerabilities

Related CVEs

CVE-2025-25746 CRITICAL 9.8 MITIGATE D-Link DIR-853 A1 FW1.20B07 was discovered to contain a stack-based buffer overflow vulnerability via the Pass
CVE-2025-25745 HIGH 8.8 MITIGATE D-Link DIR-853 A1 FW1.20B07 was discovered to contain a stack-based buffer overflow vulnerability via the Pass
CVE-2025-25744 CRITICAL 9.8 MITIGATE D-Link DIR-853 A1 FW1.20B07 was discovered to contain a stack-based buffer overflow vulnerability via the Pass
CVE-2025-25743 HIGH 7.2 MITIGATE D-Link DIR-853 A1 FW1.20B07 was discovered to contain a command injection vulnerability in the SetVirtualServe
CVE-2025-25742 CRITICAL 9.8 MITIGATE D-Link DIR-853 A1 FW1.20B07 was discovered to contain a stack-based buffer overflow vulnerability via the Acco

References

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